Determining the shape of the Universe using discrete sources

Details Determining the shape of the Universe using discrete sources Determining the shape of the Universe using discrete sources

2003-05-06

arxiv.org/abs/astro-ph/0305071v2

Class.Quant.Grav. 20 (2003) 4775-4784

Astronomy and Astrophysics

Astrophysics

11 pages, no figures

Scientific paper

10.1088/0264-9381/20/22/004

Suppose we have identified three clusters of galaxies as being topological copies of the same object. How does this information constrain the possible models for the shape of our Universe? It is shown here that, if the Universe has flat spatial sections, these multiple images can be accommodated within any of the six classes of compact orientable 3-dimensional flat space forms. Moreover, the discovery of two more triples of multiple images in the neighbourhood of the first one, would allow the determination of the topology of the Universe, and in most cases the determination of its size.

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